​You need to Enable your Skill so it will be added to the Skills of your device(s).

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You can do so by using a voice command: Alexa, enable {w. g. r. e. f. m.} - (dots are not spelled out, they just indicate letters for Alexa system), or via the Amazon App, by finding your Skill by the publication name (WGREFM) and clicking [Enable], as presented:

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https://www.youtube.com/watch?v=tiwXX9aqZvg

Note: This needs to be done only one time before you use the Skill for the first time,  The skill id number is:

B0CPHFZ9XN​​